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Regulatory Requirements - Additional Information (Detail) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Oppenheimer [Member]
Jun. 30, 2013
Freedom [Member]
Jun. 30, 2013
Oppenheimer Europe Ltd [Member]
Jun. 30, 2013
Oppenheimer Investments Asia Ltd. [Member]
Regulatory Capital Requirements [Line Items]            
Required percentage of net capital to aggregate customer-related debit items     2.00%      
Net capital     $ 158,500,000 $ 4,600,000 $ 5,400,000 $ 667,000
Actual percentage of net capital to aggregate customer-related debit items     12.20%      
Excess capital     132,400,000      
Freedom maintain net capital equal to the greater       250,000    
Aggregate indebtedness       6.67%    
Excess capital       4,300,000 2,200,000 280,000
Cash and securities segregated for regulatory and other purposes 40,055,000 33,000,000 21,900,000 17,300,000    
Regulatory capital required to be maintained         $ 3,200,000 $ 387,000